Ore-treating furmace



F. 1. BOWMAN. ORE TREATING FUHNACE.

APPLICATION FILED `DEC. 29| 191?.

Patented Dee. 6, 1921.

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NM. N

F. J. BOWMAN.

ORE TREATING FURNACE.

APPUCATIONTILED DEC. 29. 1917.

Patented De. 6, 1921.

INI/MICR- TEEDEEICK .T JBOWMABL .Y Q2, M W@ HTTQENEYS.

A 2 SHEETS-SHEET 2. f

'naar stars riant est.

FRDERXCK J. BOWMAN, F CLEVELAND, HIO, ASSIGNOR T0 THE GRASSELM CHEMEGAJ COMP j can-remarrieru-acn To all whom t may concern:

-Be it known that ll, FREDERICK' el. Bow- MAN, a citizen of the United States, and a resident of Cleveland, county of Cuyahoga, and State of Ohio, have invented a new and useful-Improvement in @re-Treating Furnaces, of which the following is a specification, the principle of the invention being herein explained, and the best mode in which l have contemplated applying that principle so as to distinguish it from other inventions.

The present invention, relating as indicated to an ore roasting furnace, has more particular regard to a roastingl furnace adapted to remove the sulfur from various lrinds of ore in the form of sulfur dioxid gas. @ne of the primary objects of the present invention is `the provision of a means for accomplishing this purpose, which shall make it possible to recover a greater percentage of the sulfur in the ore than is possible in the various types of apparatus now in general use,.in all of which there is a certainamount of waste. AAnother object of the invention is to secure this desired result without undue complication of the furnace and its parts and without the use of an unusual amount of heat; 'lo the accomplishment-of the foregoing and related ends,

v nism embodying the invention, such disclosed means constituting, however, but one,

of various mechanical forms in which the principle of the invention may be used.

ln said annexed drawings Figure 1 is a vertical section of a roasting -furnace broken in the center constructed and designed to carry out the present invention; Flg. 2 isY a second vertical section thereof taken upon a plane at right angles to the plane of the section of Fig. 1; Fig. 3 is a vertlcal section of a portion of the air heating passage and showing bailes therein; and Fig. 4 is a. horizontal section of the base of furnace showing the disposition of the several flues and passages in the walls thereof.

The general construction and arrange,

ment of passages and chambers inmy improved type of' furnace is best shown in Flgs. 1` and 2, *the furnace consisting of?.

Specification of Letters latent.

.tppicatdn led December 29, 5lat?. Serial No. 209,410.

-openings lO'in the walls and constructed to present an inclined surface 1l to the descend-` ratentea nec., e,- roar.

- substantially rectangular vertically arranged chamber '1 into which linelyv divided orev is admitted through openings 2 in the top connected' witha hopper 3. rlhe ore Awhich is admitted through the openings 2 from the hopper 1s `permitted to fall substantially vertlcally through the chamber 1 into a tapered passage 4. formed in the bottom of the furnace and connecting by means of a passage 5 with any suitable source of deposit for the fit-i ore, this passage being controlled by means of a hinged valve or gate 6.

The furnace chamber 1 is .conveniently heatedv by means of encircling passages Z which are formed in the Awalls of the chamber 1 and which are connected to a fire chamber 8 located at any suitable point adjacent to the bottom of the furnace. 'llhese heating passages or tlues 7 are connected together and/are adapted to discharge at a suitable point, as through passage 7. The inner walls of the chamber 1 are provided with a series of inwardlyextending heating units 9 connecting to the passages 7 by means of ing material. The preferred construction of these heating units or chambers is `also of interest as the main heated surface 11 is formed on a single "readily removable refractory member, which may be replaced within a minimum of time when necessary by entrance into the lfurnace through a suitable manhole in the walls thereof.

Outside of heating there are formed air assagesor ilues 7 9:0 (idr oxygen) heating passages 12 through which air is drawn...-

slowly through openings 12' over bame plates 13, shown in Fig. 3, in order to 1ncrease the distance traveled as much as possible and l secure as high a temperature as can be maintained with a given temperature in the heating'ues 7. These air heating passages 12 are connected at their upper ends by means of ducts 14 extending to and communicating with the top of the cham'- ber 1 directly below the end of the pasrco sages 2, and throughl which ducts the air is lntroduced into this chamber. The conduits 14 may be connected to the-furnace chamber at a number of spaced points, 26 27 throughout this chamber in order that air nia di erent elevations to insure a suiicient sup- .ply at allhpoints in the chamber QSQGIAIQ t' be furnished through the'ch'ambe'rA at' burning of all of the material falling therethrough. In this way the finely divided ore which falls into the chamber from the hopper is immediately and thoroughly mixed" with the heated air or oxygen coming, from the ducts 12. The draft through the chamber 1 is of course in a downward direction and this draft may be produced in various ways, an exhauster being used for the purpose if desired and located in connection with a lateral discharge opening 15 at the bottom of the furnace, through which thel gases produced during the roasting of the ore are removed.

number of relatively small triangular heat- .ing elements 16, these elements 16 .being constructed of some suitable refractory mate'- rial and being heated by the heating flues 7 20 and by the burning sulfur passed thereover to a high temperature, which in most cases will maintain these at incandescence. It will be noticed that the heating elements 416 are disposed in horizontal rows with their apices uppermost and are alternated so that between and beneath every two elements there is another element positioned with one edge uppermost and approximately directly between the center of the space between the 3'0 two members 14 above it. In this way the ore dropping .into thefchamber is spread.

over the entire area and every time aquantity of this ore strikes against one of the heating elements 16 it is divided into two pants which slide along opposite sides of the element 16 and are heated in this process.' The chamber 1 is of any suitable height and the elements 16 are relatively small and very. numerous so that in the course of its passage `4.0 from the top to the bottom in this chamber the ore is maintained at a substantially even andhigh temperature by reason of contacting the elements 16'throu hout its passage through this chamber. lghe effect of. the

'45 present construction and arrangement of the heatin elements is such as to produce a largernum er of thin sheets or columns of fine,y ore falling through the chamber at an angle to the central plane of this chamber i and at an angle to the path of-movement ofA the air or` oxygen passing therethrough. Thus at all times the ore is in contact with air or oxygen, and as the sulfur -i'n the oreis heated to the required temperature it isentirely burned into sulfurv dioxid gas, the' sulfur combining with the oxygen present or with the oxygen in the air.

Formedv in' the walls of the chamber 1 arel alarga number of regularly spaced recesses I '60 or collectin pockets 30 which serve to collect some'o the nely divided material descending through the furnace, and which permit convenient access to the chamber of a scraper or other tool for purposes of cleanes ing the baas 16 when desired Since the Disposed in the chamber 1 are a large pockets are closed by removable members or plugs 17 of, refractory material.

It has been found possible with the pres- ,ent type of furnace to secure practically a complete removal of the sulfur present in the ore, this sulfur dioxid ,beingV removed from the chamber through the discharge opening 15. y

The members 16 are supported at either end in pockets or yseats 40 and extend across the furnace chamber, these pockets or seats 40 being suitably formed in the walls of said chamber. l @ther modes of applying the -principle of my invention may be remployed instead of the one explained, change being made as regards the mechanisml herein'dlsclosed, pro- .vided the means stated by any of the fol`- lowing claims or the equivalent` of such@ stated means be employed.

I therefore. particularly point `out and distinctly claim as my invention z-fr 1. In an ore roasting furnace, the .combination of a roasting chamber, a plurality of triangular heated elements disposedV in transverse-rows with their apices upper-4 most, the elements in each row being arranged to lie between .the'elements of the next adjacent rows, means for introducing finely divided ore at one end of said-chamber, and other means' adapted to supply heated oxygen fat the same end.

2. In an ore roasting furnace, the combination of 'a roastingchamher, a pluralityY of triangular heated elementsl disposed in transverse rows with their apicesuppermost, fthe .elements in each row being arran ed to lie between the elementsf thenext Jacent rows, means for lintroducing 'finely dlvided oreat one end of said chamber, other means adapted to supply heated oxygen at the same i end, a .reservoir at the opposite end of said chamber adapted to collect the treated ore and exhaust means disposedadjacent sai v reservoir and adapted to discharge the gases 1.10 produced during the treatment of suchore. v

3. In an ore roasting furnace, the coin-` bination of a roasting chamber, a plurality of heated elements disposed in such` chamber, said chamber being formed with a plurality of collecting recesses in the walls thereof, means for introducing finely dividediore at one end of 'such chamber, and other means adapted to supply heated oxygen at the same 4 end.y 120 .4. In an ore roasting furnace, the comx bination of a roasting chambera plurality of heated elements disposed in transverse rows, said chamberbeing provided with a plurality of collecting recesses disposed beneath the ends of said heated] elements, means for introducing finely divided ore at one end of said chamber, and other means adapted to supply heated oxygen at the same end,` f i 130 meente 5. ln an ore roasting furnace, the combination of a roasting chamber, a plurality of triangular heated elements disposed in transverse rows with their lapicee uppermost, the elements in eachrow being arranged to lie beneath the elements of the next adjacent row, said chamber being formed with a plurality of` collecting pook-l ets disposed beneath the ends of each of said heated elements, said pockets being adapted to collect a portion of the material treated inl said furnace, means for introducing finely divided ore at one 'end of said chamber, and other means adapted to supply heated oxygen 'at the same end.

6. ln an ore roasting furnace, the comybination of a roasting chamber, a plurality of triangular heated elements disposed in transverse rows with their apices uppermost, the elements in each row being arranged to lie beneath the elements of the next adjacent row, said chamber being formed with a plurality of collecting pockets disposed beneath the endsof each of said heated elements, said pockets being adaptedA to collect a portion of the material treated in said furnace, removable plugs mounted in thewalls of said chamber and adapted when removed to permitl access to such pockets, means for introducing nely divided ore at one end of said chamber, and other means adapted to supply` heated oxygen at .the same end. l

Signed by me, this 24th day of December,

\ FREDERICK 'd'. BGWMAN. 

